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Adaptive CFL control circuit

A technology for controlling circuits and circuits, applied in control/regulating systems, regulating electrical variables, and the use of gas discharge lamps, etc., can solve problems such as damage to ballast output stage components, lack of tolerance, and lack of fault handling resilience. Achieving the effect of simple cost and low cost

Inactive Publication Date: 2005-11-09
INTERNATIONAL RECTIFIER COEP
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Lamp or ballast component problems can lead to serious damage to the ballast output stage components, especially for problems related to malfunction or lack of tolerance for circuit operation not in accordance with the specification
Because bipolar solutions lack resilience with respect to failure handling and have higher component counts, the characteristics in practice may be poor for some applications, resulting in poor quality systems or field failures

Method used

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  • Adaptive CFL control circuit
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Examples

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Embodiment Construction

[0025] now refer to figure 1 , depicts a block diagram of the integrated control circuit 100 according to the present invention. The control circuit 100 includes labels for the pinouts of the integrated circuit or chip, represented by boxes of numbers 1-8. Label each pin number 1-8 with the terminology denoting the pin function. Therefore, pins 1 and 2 are labeled VCC and COM, respectively, to denote power and ground for the integrated control circuit 100 . Label pins 5-8 LO, VS, HO, and VB respectively. These labels refer to typical connections for half-bridge drivers. That is, pins 5 and 7 labeled LO and HO are responsible for providing gate signals to the low and high half-bridge power switches, respectively. Pins 6 and 8, labeled VS and VB, represent power to the low and high side switches, respectively. In a typical half-bridge configuration, the two half-bridge switches are connected together at the node provided by VS at pin 6, while the high-side switch is provided...

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PUM

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Abstract

An electronic ballast provides fault detection and safety features for overcurrent protection and hard switching at a half bridge. A voltage controlled oscillator supplies a switching frequency that is modifiable based on operational feedback parameters. A feedback circuit senses load current and output voltage to determiner fault conditions and to provide control information for adaptively adjusting the frequency of the voltage controlled oscillator. By appropriately controlling the voltage controlled oscillator output, the electronic ballast maintains a zero volt switching with minimum current switching to achieve an efficient and robust electronic ballast control. The entire control is integrated on a single integrated circuit.

Description

[0001] References to related applications [0002] This application is based upon and claims the benefit of priority from US Provisional Application Serial No. 60 / 412,621, filed September 19, 2002, and entitled "Adaptive CFL Control IC." This application is also related to US Application Serial No. 10 / 616,173, filed July 8, 2003, and entitled "Adaptive Ballast Control IC." technical field [0003] This invention relates generally to ballasts for compact fluorescent lamps, and more particularly to adaptive ballast control for compact ballasts in integrated circuits. Background technique [0004] Electronic ballasts for fluorescent lamp applications are widely used and include integrated circuits to implement standard functions, application specific integrated circuits to provide additional functionality, and microcontrollers to allow programmable control of fluorescent lamps. Functions performed by these controllers typically include power factor compensation and lamp and / or...

Claims

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Application Information

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IPC IPC(8): G05F1/00
CPCY02B20/19
Inventor T・里巴里希D・威廉
Owner INTERNATIONAL RECTIFIER COEP
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